F. M. Angelici and A. Fiorillo, “Repeated sightings of Alexandrine parakeet Psittacula eupatria in Rome (Central Italy) and its likely acclimatization”, Riv Ital Ornitol, vol. 85, no. 2, pp. 33–35, Aug. 2016, doi: 10.4081/rio.2015.211.